'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')
const CopyWebpackPlugin = require('copy-webpack-plugin')

function resolve(dir) {
	return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
	/**
	 * You will need to set publicPath if you plan to deploy your site under a sub path,
	 * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
	 * then publicPath should be set to "/bar/".
	 * In most cases please use '/' !!!
	 * Detail: https://cli.vuejs.org/config/#publicpath
	 */
	publicPath: './',
	outputDir: 'dist',
	assetsDir: 'static',
	lintOnSave: process.env.NODE_ENV === 'development',
	productionSourceMap: false,
	devServer: {
		port: port,
		open: true,
		overlay: {
			warnings: false,
			errors: true
		},
		// before: require('./mock/mock-server.js')
	},
	configureWebpack: {
		// provide the app's title in webpack's name field, so that
		// it can be accessed in index.html to inject the correct title.
		name: name,
		resolve: {
			alias: {
				'@': resolve('src')
			}
		},
		plugins: [
			new CopyWebpackPlugin([
				{
					//使用static文件夹
					from: './static',
					to: 'static',
				},
			]),
		],
	},
	chainWebpack(config) {
		// it can improve the speed of the first screen, it is recommended to turn on preload
		config.plugin('preload').tap(() => [
			{
				rel: 'preload',
				// to ignore runtime.js
				// https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
				fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
				include: 'initial'
			}
		])
		
		// when there are many pages, it will cause too many meaningless requests
		config.plugins.delete('prefetch')
		
		// set svg-sprite-loader
		config.module
			.rule('svg')
			.exclude.add(resolve('src/icons'))
			.end()
		config.module
			.rule('icons')
			.test(/\.svg$/)
			.include.add(resolve('src/icons'))
			.end()
			.use('svg-sprite-loader')
			.loader('svg-sprite-loader')
			.options({
				symbolId: 'icon-[name]'
			})
			.end()
		
		config
			.when(process.env.NODE_ENV !== 'development',
				config => {
					config
						.plugin('ScriptExtHtmlWebpackPlugin')
						.after('html')
						.use('script-ext-html-webpack-plugin', [{
							// `runtime` must same as runtimeChunk name. default is `runtime`
							inline: /runtime\..*\.js$/
						}])
						.end()
					config
						.optimization.splitChunks({
						chunks: 'all',
						cacheGroups: {
							libs: {
								name: 'chunk-libs',
								test: /[\\/]node_modules[\\/]/,
								priority: 10,
								chunks: 'initial' // only package third parties that are initially dependent
							},
							elementUI: {
								name: 'chunk-elementUI', // split elementUI into a single package
								priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
								test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
							},
							commons: {
								name: 'chunk-commons',
								test: resolve('src/components'), // can customize your rules
								minChunks: 3, //  minimum common number
								priority: 5,
								reuseExistingChunk: true
							}
						}
					})
					// https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
					config.optimization.runtimeChunk('single')
				}
			)
	}
}
